Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1299, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2023.137074
Keywords
Viologens; Supramolecules; Photochromism; Crystal structure; Inkless and erasable printing
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Four novel supramolecules based on viologen moiety and different benzenecarboxylic acids were synthesized. These materials exhibit obvious photochromic behaviors upon UV irradiation and possess photo-controlled fluorescence and inkless and erasable printing capabilities.
Donor-acceptor (D-A) photochromic materials have attracted extensive attention due to their broad application prospects. Herein, based on the viologen moiety (Bcbpy = 1-(4-carboxybenzyl)-4,4 '-bipyridinium) and different benzenecarboxylic acids (H3BTC = 1,3,5-benzenetricarboxylic acid; m-H3BTC = 1,2,4-benzenetricarboxylic acid; H4BTEC = 1,2,4,5-benzenetetracarboxylic acid; 1,4-H2NDC = 1,4-naphthalenedicarboxylic acid), four novel supramolecules have been prepared, namely (H2Bcbpy)(H2BTC)2 center dot(H3BTC)center dot H2O (1), (HBcbpy)(m-H2BTC)center dot 2H2O (2), (HBcbpy)(H2BTEC)0.5 center dot 3H2O (3), (HBcbpy)(1,4-HNDC) (4). The D-A system is formed by hydrogen bonding between the electron-deficient viologen acceptor and the electron-donating benzenecarboxylate donors. After UV irradiation, the photo-activated electrons can transfer from D to A in four compounds, exhibiting obvious photochromic behaviors. In addition, the photo-controlled fluorescence and the inkless and erasable printing capabilities are studied.
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